Differential Maintenance - AWD Models - Toyota Sienna Forum - siennachat.com
 
LinkBack Thread Tools
post #1 of 7 (permalink) Old 07-05-2010, 11:47 PM Thread Starter
Member
 
jman1200's Avatar
 
Join Date: Mar 2009
Location: Ontario - Canada
Posts: 108
Differential Maintenance - AWD Models

My rear differential started leaking, occasionally I would find one or two drops of oil on the garage floor.
I looked under and noticed that it was leaking through one of the oil seals, long story short, it was being caused by the vent being seized, this is one of those parts I thought to be maintenance free... big mistake.
I removed the vent (pic 1) and it looked like a one piece component. I dipped it in a strong solvent and waited a while but still, one solid piece (pic 2). I tried to blow air through it and nothing. I then decide to risk it and took a wrench and pliers and twist it (pic 3), it finally moved and a lot of debris started falling down. I cleaned it pretty well and reinstalled it.
I then changed the oil (pic 4), removed the fill plug (pic 5) and the drain plug (pics 6 & 7), this last one was full of old oil (almost grease) around the magnet. Finally added the new oil (pic 8 ) and torque the plugs.
I strongly recommend all AWD owners to check this vent at least after every winter (maybe its in the manual and I never noticed it), get under and try to turn vent cap with your fingers, if you can't, remove it and clean it.
I hope the pics help.
Attached Images
File Type: jpg Dif 1.jpg (278.2 KB, 359 views)
File Type: jpg Dif 2.jpg (192.6 KB, 300 views)
File Type: jpg Dif 3.jpg (242.8 KB, 288 views)
File Type: jpg Dif 4.jpg (277.6 KB, 256 views)
File Type: jpg Dif 5.jpg (264.1 KB, 250 views)
File Type: jpg Dif 6.jpg (272.7 KB, 243 views)
File Type: jpg Dif 7.jpg (221.7 KB, 224 views)
File Type: jpg Dif 8.jpg (282.2 KB, 244 views)

2004 TOYOTA SIENNA LE AWD
2015 NISSAN PATHFINDER SL-TECH
2006 MAZDA 6 GT-V6
jman1200 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 07-06-2010, 07:09 PM
Supporting Member
 
Join Date: Feb 2009
Posts: 1,316
Re: Differential Maintenance - AWD Models

Great tip.

2004 CE
AIR LIFT '1000'
OVERHEAD 'DEALER' DVD
'HITCH CITY' 2' HITCH
Support 'SIENNACHAT' HERE

Best Auto Insurance | Auto Protection Today | FREE Trade-In Quote
robo5 is offline  
post #3 of 7 (permalink) Old 07-19-2010, 10:32 PM
Supporting Member
 
Join Date: Feb 2009
Posts: 223
Re: Differential Maintenance - AWD Models

Quote:
Originally Posted by jmanotas
My rear differential started leaking, occasionally I would find one or two drops of oil on the garage floor.
I looked under and noticed that it was leaking through one of the oil seals, long story short, it was being caused by the vent being seized, this is one of those parts I thought to be maintenance free... big mistake.
I removed the vent (pic 1) and it looked like a one piece component. I dipped it in a strong solvent and waited a while but still, one solid piece (pic 2). I tried to blow air through it and nothing. I then decide to risk it and took a wrench and pliers and twist it (pic 3), it finally moved and a lot of debris started falling down. I cleaned it pretty well and reinstalled it.
I then changed the oil (pic 4), removed the fill plug (pic 5) and the drain plug (pics 6 & 7), this last one was full of old oil (almost grease) around the magnet. Finally added the new oil (pic 8 ) and torque the plugs.
I strongly recommend all AWD owners to check this vent at least after every winter (maybe its in the manual and I never noticed it), get under and try to turn vent cap with your fingers, if you can't, remove it and clean it.
I hope the pics help.
Thanks for the big tip! My van has around 200k on it and the breather was indeed stuck also. I think that anyone with and awd model should be looking at this! I haven't had any leaks and maybe won't thanks to this website!

cheers,

shineysideup
shineysideup is offline  
 
post #4 of 7 (permalink) Old 08-19-2015, 03:41 PM
Junior Member
 
Join Date: Aug 2015
Posts: 2
Re: Differential Maintenance - AWD Models

I know what I'll be doing Saturday. How is the '04 holding up? Do you still have it?

--------------------------
2007 Silver Sienna XLE
Denver
Bchristofferson is offline  
post #5 of 7 (permalink) Old 04-28-2016, 05:06 PM Thread Starter
Member
 
jman1200's Avatar
 
Join Date: Mar 2009
Location: Ontario - Canada
Posts: 108
Re: Differential Maintenance - AWD Models

Haven't been around for a while, yes, still have it and its now my daily driver. Bought a 2015 Pathfinder that became our travel/towing vehicle which is nice but far off from the comfort and roominess of the Sienna.

2004 TOYOTA SIENNA LE AWD
2015 NISSAN PATHFINDER SL-TECH
2006 MAZDA 6 GT-V6
jman1200 is offline  
post #6 of 7 (permalink) Old 03-17-2017, 06:25 PM
Junior Member
 
Join Date: Mar 2017
Posts: 1
Re: Differential Maintenance - AWD Models

So how did you determine the leak was caused by the vent and not actually a bad seal? I've got a little leakage and was going to replace the seal(s), but will have to check the vent first in case that's my problem.
FlashJT is offline  
post #7 of 7 (permalink) Old 03-17-2017, 09:04 PM Thread Starter
Member
 
jman1200's Avatar
 
Join Date: Mar 2009
Location: Ontario - Canada
Posts: 108
Re: Differential Maintenance - AWD Models

Simple physics.

The air and the oil inside the differential expand as they heat up, if the vent is clogged/seized the air will build up pressure and the next weakest point are the oils seals. The pressure will push air and some oil through the seals.
I posted that in 2010, seven years later it hasn't leaked back once. Back then the dealer wanted $800 to replace the seals.

This applies to the transmissions as well. I recently bought a used Mazda 6 with a manual transmission which I found to be leaking... guess how I fixed it...

Not saying this will always be the case but definitely the first and cheapest thing to do.

2004 TOYOTA SIENNA LE AWD
2015 NISSAN PATHFINDER SL-TECH
2006 MAZDA 6 GT-V6

Last edited by jman1200; 03-18-2017 at 01:29 AM.
jman1200 is offline  
Reply

Tags
awd, differential, maintenance, models

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Toyota Sienna Forum - siennachat.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome